You can get the circumference of a circle using either the equation radius times 2 times Pi or diameter times Piand im guessing by wide you mean diameter.
So 13 x 3.14 (Pi)
3.14
x 13
------
942
3140
-------
4082
then add the decimal
40.82
so 40.82 ft is your answer
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Circumference = (pi) x (diameter) = 13 pi = 40.841 feet(rounded)
2*pi*radius = circumference 2*pi*radius = 13 Making the radius the subject of the formula is: radius = 13/(2*pi) = 2.06901426 feet Check: 2*pi*2.06901426 = 13 feet
The circumference of a 13 inch round circle is: about 40.84 inches.To do this calculation for other circles, just multiply the diameter by Pi (about 3.1416). The result is the circumference.
13 pi or ~40in
81.7 cm